EricWF added a comment.
A large portion of this patch is UB. Any function that unconditionally calls
`__get_db()` can never be a valid constant expression, hence UB.
Is there a smaller set of operations or `__wrap_iter` that *must* be made
constexpr? Or do they all need to be?
==
EricWF added a comment.
Could you re-upload this with a updated diff against trunk, and one with more
context.
https://reviews.llvm.org/D34237
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mclow.lists created this revision.
`__wrap_iter` is an internal libc++ class used to, well, wrap other iterators
(such as pointers) when we need or want an object type.
Mark the operations on `__wrap_iter` as constexpr, so that they can be used in
a constexpr context if the underlying iterator
